Aude is a department in Southern France, located in the Occitanie region and named after the river Aude. The departmental council also calls it "Cathar Country" after a group of religious dissidents active in the 12th to 14th centuries.

In the administrative divisions of France, the department is one of the three levels of government under the national level, between the administrative regions and the communes. Ninety-six departments are in metropolitan France, with an additional five constituting overseas departments, which are also classified as overseas regions. Departments are further subdivided into 333 arrondissements and 2,054 cantons. These last two levels of government have no political autonomy, instead serving as the administrative basis for the local organisation of police, fire departments as well as, in certain cases, elections.